from math import sqrt

"""自制计算器"""

def add(x, y):
    return x + y

def sub(x, y):
    return x - y

def mul(x, y):
    return x * y

def div(x, y):
    return x / y

def div_(x, y):
    return x // y

def rem(x, y):
    return x % y

def pow(x, y):
    return x ** y

def sqr(x):
    return sqrt(x)

